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Asked by Elnaz Last Modified
Answer 
Tasneem
(a)
When the two discs are joined together, their moments of inertia get added up.
Moment of inertia of the system of two discs, 
Let ω be the angular speed of the system.
Total final angular momentum, 
Using the law of conservation of angular momentum, we have:
(b)Kinetic energy of disc I,
Kinetic energy of disc II,
Total initial kinetic energy, 
When the discs are joined, their moments of inertia get added up.
Moment of inertia of the system,
Angular speed of the system = ω
Final kinetic energy Ef:
The loss of KE can be attributed to the frictional force that comes into play when the two discs come in contact with each other.
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